package com.tangsm.spring.boot.degradation.util;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

/**
 *
 * @author TanSM
 */
@Component
public class SpringContextUtil implements ApplicationContextAware {
    public static ApplicationContext applicationContext;

    /**
     * 设置该对象运行的ApplicationContext。通常此调用将用于初始化该对象。
     * @param applicationContext the ApplicationContext object to be used by this object
     * @throws BeansException bean 包和子包中抛出的所有异常的抽象超类
     */
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        SpringContextUtil.applicationContext = applicationContext;
    }

    public static void setContext(ApplicationContext applicationContext) {
        if (SpringContextUtil.applicationContext == null) {
            SpringContextUtil.applicationContext = applicationContext;
        }
    }


    public static Object getBean(String name) {
        return applicationContext.getBean(name);
    }

    public static <T> T getBean(String name, Class<T> requiredType) {
        return applicationContext.getBean(name, requiredType);
    }

    public static boolean containsBean(String name) {
        return applicationContext.containsBean(name);
    }

    public static boolean isSingleton(String name) {
        return applicationContext.isSingleton(name);
    }

    public static Class<? extends Object> getType(String name) {
        return applicationContext.getType(name);
    }

    public static <T> T getBean(Class<T> requiredType) {
        return applicationContext.getBean(requiredType);
    }

}
